Pen



FIG. 1 is a top, front, left side perspective view of a pen showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevation view thereof, the rear elevation view being identical; and,

FIG. 5 is a left elevation view thereof, the right side elevation view being identical.

The broken lines in FIGS. 1, 3, 4, and 5 are included for the purposes of illustrating a feature that forms no part of the claimed design. 

CLAIM The ornamental design for a pen, as shown and described. 